commons-email2-jakarta/src/main/java/org/apache/commons/mail2/jakarta/util/IDNEmailAddressConverter.java [33:100]:
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public class IDNEmailAddressConverter {

    /**
     * Constructs a new instance.
     */
    public IDNEmailAddressConverter() {
        // empty
    }

    /**
     * Extracts the domain part of the email address.
     *
     * @param email email address.
     * @param idx   index of '@' character.
     * @return domain part of email
     */
    private String getDomainPart(final String email, final int idx) {
        return email.substring(idx + 1);
    }

    /**
     * Extracts the local part of the email address.
     *
     * @param email email address.
     * @param idx   index of '@' character.
     * @return local part of email
     */
    private String getLocalPart(final String email, final int idx) {
        return email.substring(0, idx);
    }

    /**
     * Converts an email address to its ASCII representation using "Punycode".
     *
     * @param email email address.
     * @return The ASCII representation
     * @throws IllegalArgumentException if the domain doesn't conform to RFC 3490 specification
     */
    public String toASCII(final String email) {
        return toString(email, IDN::toASCII);
    }

    private String toString(final String email, final Function<String, String> converter) {
        final int idx = email == null ? -1 : email.indexOf('@');
        if (idx < 0) {
            return email;
        }
        return getLocalPart(email, idx) + '@' + converter.apply(getDomainPart(email, idx));
    }

    /**
     * Converts the address part of an InternetAddress to its Unicode representation.
     *
     * @param address email address.
     * @return The Unicode representation
     */
    String toUnicode(final InternetAddress address) {
        return address != null ? toUnicode(address.getAddress()) : null;
    }

    /**
     * Converts an "Punycode" email address to its Unicode representation.
     *
     * @param email email address.
     * @return The Unicode representation
     */
    String toUnicode(final String email) {
        return toString(email, IDN::toUnicode);
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commons-email2-javax/src/main/java/org/apache/commons/mail2/javax/util/IDNEmailAddressConverter.java [33:100]:
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public class IDNEmailAddressConverter {

    /**
     * Constructs a new instance.
     */
    public IDNEmailAddressConverter() {
        // empty
    }

    /**
     * Extracts the domain part of the email address.
     *
     * @param email email address.
     * @param idx   index of '@' character.
     * @return domain part of email
     */
    private String getDomainPart(final String email, final int idx) {
        return email.substring(idx + 1);
    }

    /**
     * Extracts the local part of the email address.
     *
     * @param email email address.
     * @param idx   index of '@' character.
     * @return local part of email
     */
    private String getLocalPart(final String email, final int idx) {
        return email.substring(0, idx);
    }

    /**
     * Converts an email address to its ASCII representation using "Punycode".
     *
     * @param email email address.
     * @return The ASCII representation
     * @throws IllegalArgumentException if the domain doesn't conform to RFC 3490 specification
     */
    public String toASCII(final String email) {
        return toString(email, IDN::toASCII);
    }

    private String toString(final String email, final Function<String, String> converter) {
        final int idx = email == null ? -1 : email.indexOf('@');
        if (idx < 0) {
            return email;
        }
        return getLocalPart(email, idx) + '@' + converter.apply(getDomainPart(email, idx));
    }

    /**
     * Converts the address part of an InternetAddress to its Unicode representation.
     *
     * @param address email address.
     * @return The Unicode representation
     */
    String toUnicode(final InternetAddress address) {
        return address != null ? toUnicode(address.getAddress()) : null;
    }

    /**
     * Converts an "Punycode" email address to its Unicode representation.
     *
     * @param email email address.
     * @return The Unicode representation
     */
    String toUnicode(final String email) {
        return toString(email, IDN::toUnicode);
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